[ I ] to make a continuous low sound发出连续低沉的声音,嗡嗡作响
[ I or T ] to sing without opening your mouth哼(曲子)
[ I ] informal to be busy and full of activity, excitement, sounds, or voices忙乱,忙碌;嘈杂
a continuous low noise持续低沉的噪音;嗡嗡声
noun
verb
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